*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:#050B16;
  background-image:
    linear-gradient(to right,rgba(30,51,80,.55) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(30,51,80,.55) 1px,transparent 1px);
  background-size:40px 40px;
  background-position:center top;
  color:#EAF1FA;
  font-family:"Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
:root{
  --ink-900:#050B16;
  --ink-800:#0B1626;
  --ink-700:#14233A;
  --line:#1E3350;
  --cyan:#35E6D2;
  --amber:#FFB347;
  --text:#EAF1FA;
  --text-2:#9AAEC7;
  --text-3:#6E86A6;
  --indigo:#5F8FD6;
  --violet:#9B7BE0;
  --jade:#4FB08C;
  --ochre:#C97C6A;
  --paper:#F4F7FB;
  --shadow:0 12px 32px rgba(0,20,40,.35);
  --font-sans:"Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shell:1200px;
  --pad:clamp(16px,4vw,32px);
  --r:4px;
  --header-h:56px;
}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
[hidden]{display:none !important}
h1,h2,h3,h4{margin:0;font-weight:900;line-height:1.18;letter-spacing:-.02em;font-stretch:95%}
h1{font-size:clamp(2.25rem,5vw,3rem)}
h2{font-size:clamp(1.6rem,3.2vw,2rem)}
h3{font-size:1.25rem;font-weight:700;line-height:1.35}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
strong{font-weight:700;color:var(--text)}
code,kbd,samp{font-family:var(--font-mono);font-size:.9em;color:var(--cyan)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
[id]{scroll-margin-top:80px}
#main-content{display:block}
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad)}
.skip-link{
  position:absolute;left:var(--pad);top:-80px;z-index:200;
  background:var(--cyan);color:#04121A;font-weight:700;font-size:15px;
  padding:10px 18px;border-radius:var(--r);text-decoration:none;
  transition:top .2s ease;
}
.skip-link:focus{top:10px;text-decoration:none}
/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(5,11,22,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  transition:background .2s ease,box-shadow .2s ease;
}
.header-inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  grid-template-areas:"brand nav utility";
  align-items:center;
  gap:clamp(12px,2vw,28px);
  min-height:var(--header-h);
  transition:min-height .2s ease;
}
.site-header.is-stuck{background:rgba(5,11,22,.99);box-shadow:0 10px 28px rgba(0,10,25,.55)}
.site-header.is-stuck .header-inner{min-height:48px}
.site-header.is-stuck .nav-link{padding-block:6px}
.brand{
  grid-area:brand;display:flex;flex-direction:column;gap:1px;
  padding-right:clamp(10px,2vw,22px);
  border-right:1px solid var(--line);
  color:var(--text);text-decoration:none;min-width:0;
}
.brand:hover{text-decoration:none}
.brand-name{font-size:20px;font-weight:900;letter-spacing:-.02em;font-stretch:95%;line-height:1.1;transition:color .18s ease}
.brand:hover .brand-name,.brand:focus-visible .brand-name{color:var(--cyan)}
.brand-sub{font-family:var(--font-mono);font-size:10px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--text-3);white-space:nowrap}
.nav-toggle{
  grid-area:toggle;display:none;align-items:center;gap:8px;
  padding:8px 12px;border:1px solid var(--line);border-radius:var(--r);
  background:var(--ink-800);color:var(--text-2);cursor:pointer;
  font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.08em;
  transition:border-color .18s ease,color .18s ease,background .18s ease;
}
.nav-toggle:hover{background:var(--ink-700);color:var(--text);border-color:var(--cyan)}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-icon{
  width:16px;height:12px;flex:0 0 auto;
  background:
    linear-gradient(var(--cyan),var(--cyan)) top left/100% 2px no-repeat,
    linear-gradient(var(--cyan),var(--cyan)) center left/100% 2px no-repeat,
    linear-gradient(var(--cyan),var(--cyan)) bottom left/100% 2px no-repeat;
}
.nav-toggle-text{line-height:1}
.site-nav{grid-area:nav;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{position:relative;flex:0 0 auto}
.nav-link{
  position:relative;display:flex;align-items:baseline;gap:6px;
  padding:8px 10px;border:1px solid transparent;border-radius:var(--r);
  color:var(--text-2);font-size:15px;font-weight:500;line-height:1.2;
  text-decoration:none;
  transition:color .18s ease,background .18s ease,border-color .18s ease;
}
.nav-link:hover{color:var(--text);background:var(--ink-800);text-decoration:none}
.nav-num{font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.04em;color:var(--text-3);font-variant-numeric:tabular-nums}
.nav-label{font-weight:700;white-space:nowrap}
.nav-link[aria-current="page"]{color:var(--text);background:var(--ink-700);border-color:var(--line)}
.nav-link[aria-current="page"] .nav-num{color:var(--cyan)}
.nav-link[aria-current="page"]::before{
  content:"";position:absolute;left:3px;top:50%;transform:translateY(-50%);
  width:2px;height:16px;background:var(--cyan);border-radius:2px;
}
.header-utility{grid-area:utility;display:flex;align-items:center;gap:14px;justify-self:end}
.status{
  margin:0;display:flex;align-items:center;gap:8px;white-space:nowrap;
  font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.04em;color:var(--text-3);
}
.status-dot{
  width:6px;height:6px;flex:0 0 auto;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,230,210,.16);
  animation:statusPulse 2.6s ease-in-out infinite;
}
@keyframes statusPulse{0%,100%{opacity:.5}50%{opacity:1}}
.header-progress{
  position:absolute;left:0;bottom:-1px;height:2px;width:0;
  background:var(--cyan);transition:width .12s linear;
}
/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:1px solid var(--line);border-radius:var(--r);
  background:var(--ink-800);color:var(--text);
  font-family:var(--font-sans);font-size:15px;font-weight:700;line-height:1.2;
  text-decoration:none;cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:hover{text-decoration:none;background:var(--ink-700);border-color:var(--cyan);color:#fff}
.btn:active{transform:translateY(1px)}
.btn--amber{background:transparent;border-color:var(--amber);color:var(--amber)}
.btn--amber:hover{background:var(--amber);border-color:var(--amber);color:#1A1002}
.btn--cyan{background:var(--cyan);border-color:var(--cyan);color:#04121A}
.btn--cyan:hover{background:#5CF0DE;border-color:#5CF0DE;color:#04121A}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--text-2)}
.btn--ghost:hover{color:var(--text);border-color:var(--cyan);background:var(--ink-800)}
.btn--sm{font-size:13px;padding:7px 14px}
.btn--block{display:flex;width:100%}
/* ---------- tags & chips ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid currentColor;border-radius:2px;
  font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.06em;line-height:1.4;
  color:var(--text-2);vertical-align:middle;
}
.tag[data-tone="indigo"]{color:var(--indigo)}
.tag[data-tone="violet"]{color:var(--violet)}
.tag[data-tone="jade"]{color:var(--jade)}
.tag[data-tone="ochre"]{color:var(--ochre)}
.tag[data-tone="cyan"]{color:var(--cyan)}
.tag[data-tone="amber"]{color:var(--amber)}
.tag--dot{padding:0;width:8px;height:8px;border:0;border-radius:1px;background:currentColor;flex:0 0 auto}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 13px;border:1px solid var(--line);border-radius:var(--r);
  background:var(--ink-800);color:var(--text-2);
  font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.04em;
  cursor:pointer;transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.chip:hover{color:var(--text);border-color:var(--cyan)}
.chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#04121A}
/* ---------- layout pieces ---------- */
.main{padding-block:clamp(24px,4vw,48px) 0}
.section{padding-block:clamp(24px,4vw,44px)}
.stack{display:flex;flex-direction:column;gap:20px}
.grid{display:grid;gap:20px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.panel{
  position:relative;background:var(--ink-800);
  border:1px solid var(--line);border-radius:var(--r);
  padding:clamp(18px,2.6vw,28px);
  box-shadow:var(--shadow);
}
.panel--raised{background:var(--ink-700)}
.panel-head{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:10px 16px;
  margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--line);
}
.panel-num{font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.14em;color:var(--cyan)}
.panel-title{font-size:20px;font-weight:900;letter-spacing:-.01em}
.panel-tools{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.band{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 20px;
  background:var(--ink-700);border:1px solid var(--line);border-left:3px solid var(--amber);
  border-radius:var(--r);padding:clamp(14px,2vw,20px) clamp(16px,2.4vw,24px);
}
.band-text{margin:0;font-size:16px;color:var(--text)}
.prose{max-width:68ch;font-size:17px;line-height:1.8;color:var(--text-2)}
.prose h2,.prose h3{color:var(--text);margin:1.4em 0 .5em}
.prose h2:first-child,.prose h3:first-child{margin-top:0}
.prose ul,.prose ol{list-style:revert;padding-left:1.3em;margin:0 0 1em}
.prose li{margin:.3em 0}
.prose strong{color:var(--text)}
.breadcrumb{margin-bottom:18px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--text-3)}
.breadcrumb-item{display:flex;align-items:center;gap:8px}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--line)}
.breadcrumb-link{color:var(--text-2);text-decoration:none}
.breadcrumb-link:hover{color:var(--cyan);text-decoration:none}
.breadcrumb-current{color:var(--text)}
/* ---------- figure / media ---------- */
.figure{margin:0;display:flex;flex-direction:column;gap:10px}
.figure-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--r);
  background:var(--ink-800);aspect-ratio:16/9;
}
.figure-frame--wide{aspect-ratio:21/9}
.figure-frame--device{aspect-ratio:9/16;max-width:260px;border-radius:12px}
.figure-frame img,.figure-media{display:block;width:100%;height:100%;object-fit:cover}
.figure-media{
  background:
    linear-gradient(135deg,rgba(53,230,210,.14),transparent 58%),
    linear-gradient(180deg,var(--ink-700),var(--ink-800));
}
.figure-cap{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--text-3)}
/* ---------- motion ---------- */
.js-ready [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .24s cubic-bezier(.2,.7,.2,1),transform .24s cubic-bezier(.2,.7,.2,1);
  transition-delay:var(--reveal-delay,0ms);
}
.js-ready [data-reveal].is-in{opacity:1;transform:none}
.is-flash{
  outline:2px solid var(--cyan);outline-offset:3px;
  animation:flashFade .6s ease forwards;
}
@keyframes flashFade{0%{outline-color:var(--cyan)}100%{outline-color:rgba(53,230,210,0)}}
/* ---------- footer ---------- */
.site-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--ink-900);
  border-top:1px solid var(--line);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
.footer-inner{padding-block:clamp(36px,5vw,56px)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.4fr;gap:clamp(18px,3vw,34px)}
.footer-col{border-left:1px solid var(--line);padding-left:clamp(14px,2vw,22px);min-width:0}
.footer-col:first-child{border-left:0;padding-left:0}
.footer-col--brand{display:flex;flex-direction:column}
.footer-brand{display:flex;flex-direction:column;gap:3px;color:var(--text);text-decoration:none}
.footer-brand:hover{text-decoration:none}
.footer-brand:hover .footer-brand-name{color:var(--cyan)}
.footer-brand-name{font-size:22px;font-weight:900;letter-spacing:-.02em;font-stretch:95%;line-height:1.1;transition:color .18s ease}
.footer-brand-sub{font-family:var(--font-mono);font-size:10px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--text-3)}
.footer-note{margin:16px 0 0;max-width:34ch;font-size:15px;line-height:1.8;color:var(--text-2)}
.footer-title{
  margin:0 0 14px;font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;color:var(--text-3);
}
.footer-index-item{display:flex;align-items:center;gap:8px;padding:4px 0;font-size:15px;color:var(--text-2)}
.footer-num{font-family:var(--font-mono);font-size:12px;font-weight:600;color:var(--text-3);font-variant-numeric:tabular-nums}
.footer-item{padding:4px 0}
.footer-link{color:var(--text-2);font-size:15px;text-decoration:none;border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.footer-link:hover{color:var(--cyan);border-bottom-color:var(--cyan);text-decoration:none}
.footer-link--more{display:inline-block;margin-top:14px;font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--cyan);border-bottom:1px solid transparent}
.footer-link--more:hover{border-bottom-color:var(--cyan)}
.footer-contact{margin-bottom:16px}
.footer-contact li{display:flex;gap:10px;padding:3px 0;font-size:14px;line-height:1.6;color:var(--text-2)}
.footer-key{flex:0 0 32px;padding-top:2px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--text-3)}
.footer-val{font-family:var(--font-mono);font-size:13px;color:var(--text);word-break:break-word}
.footer-legal{border-top:1px solid var(--line);padding-block:16px}
.footer-legal-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 20px}
.footer-legal-line{margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;color:var(--text-3)}
/* ---------- responsive ---------- */
@media (max-width:1100px){
  .status{display:none}
}
@media (max-width:960px){
  .grid--split,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col{padding-left:0;border-left:0}
  .footer-col:nth-child(n+3){border-top:1px solid var(--line);padding-top:22px;margin-top:4px}
  .footer-col:nth-child(2){border-left:1px solid var(--line);padding-left:18px}
}
@media (max-width:860px){
  .header-inner{
    grid-template-columns:minmax(0,1fr) auto auto;
    grid-template-areas:
      "brand utility toggle"
      "nav nav nav";
    gap:10px 10px;
    padding-block:9px;
    min-height:0;
  }
  .site-header.is-stuck .header-inner{min-height:0}
  .brand{flex-direction:row;align-items:baseline;gap:8px;border-right:0;padding-right:0}
  .brand-name{font-size:18px}
  .brand-sub{font-size:9px;letter-spacing:.1em;overflow:hidden;text-overflow:ellipsis}
  .nav-toggle{display:inline-flex}
  .header-utility{justify-self:end;gap:0}
  .site-nav{display:none;margin-inline:calc(var(--pad) * -1);padding-inline:var(--pad)}
  .site-nav[data-open]{display:block;border-top:1px solid var(--line);margin-top:4px;padding-top:10px;padding-bottom:2px}
  .nav-list{overflow-x:auto;gap:6px;padding-bottom:8px;scrollbar-width:thin;scroll-snap-type:x proximity}
  .nav-item{scroll-snap-align:start}
  .nav-link{background:var(--ink-800);border-color:var(--line);padding:9px 13px}
  .nav-link[aria-current="page"]::before{display:none}
  .nav-link[aria-current="page"]{border-color:var(--cyan);box-shadow:inset 0 0 0 1px rgba(53,230,210,.35)}
  .btn--sm{font-size:12px;padding:7px 11px}
}
@media (max-width:620px){
  body{font-size:16px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-col:nth-child(2){border-left:0;padding-left:0}
  .footer-col{border-top:1px solid var(--line);padding-top:20px}
  .footer-col:first-child{border-top:0;padding-top:0}
  .footer-legal-inner{justify-content:flex-start}
  .figure-frame--device{max-width:100%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-ready [data-reveal]{transform:none;opacity:1;transition:none}
  .header-progress{transition:none}
}